Hydrothermal synthesis and structure characterization of the first organically templated metal iodates

The first organically templated molybdenum iodates (C5H6N)2Mo2O5(IO3)4(H2O)2 (1), (C10H8N2)[MoO2(IO3)3] · H3O (2), and uranium iodate (C5H5N)2[(UO2)(IO3)3](IO3) (3), have been successfully synthesized under mild hydrothermal conditions. Compound 1 is simple zero-dimensional units consisting of [(Mo2O5(IO3)4)]2− anions, which can be described as a tetranuclear unit hanged on either side by two [IO3] groups. The [Mo2O5(IO3)4]2− anions are in a close connection through the water molecules and protonated pyridine cations, via hydrogen bonds and intermolecular actions. Compound 2 is built up from [MoO6] octahedra and [IO3] pyramids to two-dimensional layers, in which 4,4′-bipy molecules and water cations are located, forming strong hydrogen bonds with the inorganic framework, leading to pseudo three-dimensional structure. Compound 3 is one-dimensional ribbons containing {[(UO2)(IO3)3](IO3)}2− anions and charge neutrality is achieved by the protonated 4,4′-bipy cations, which reside between two ribbons, forming hydrogen bonds with the inorganic framework and resulting in pseudo two-dimensional structure. Crystal data are as follows: (C5H6N)2Mo2O5(IO3)4(H2O)2 (1), orthorhombic, Pnma, a = 24.097(5) Å, b = 13.532(3) Å, c = 7.836(16) Å, Z = 4, V = 2555.2(9) Å3; (C10H8N2)[MoO2(IO3)3] · H3O (2), monoclinic, C2/c, a = 24.176(5) Å, b = 10.751(2) Å, c = 7.5074(15) Å, β = 107.44(3)°, Z = 8, V = 1861.6(6) Å3; (C5H5N)2[(UO2)(IO3)3](IO3) (3), monoclinic, P21/n, a = 14.430(3) Å, b = 7.3459(15) Å, c = 19.811(4) Å, β = 106.70(3)°, Z = 4, V = 2011.3(7) Å3.